There is of little significance advocating a company to do that. Unless it's regulated and legislated. Any company who willingly gave up such advantange in cost

There is of little significance advocating a company to do that. Unless it's regulated and legislated. Any company who willingly gave up such advantange in cost would be a fool and lost its market due to such policies unless that company has other unique advantange to keep their market position. People like to talk about how they love "locally-sourced products" until they realized they had to pay double or triple.